http://www.mathslideshows.com •Remove all other thoughts from your mind. •Pay close attention. •Try all the examples. •Ignore all other distractions. http://www.mathslideshows.com Polygon: Any straight-sided closed plane figure. http://www.mathslideshows.com Polygons come in all shapes and sizes. http://www.mathslideshows.com # of sides Name Picture 3 Triangle 4 Quadrilateral 5 Pentagon 6 Hexagon 8 Octagon 10 Decagon http://www.mathslideshows.com Name The Quadrilateral 1) 2) trapezoid 3) rhombus 4) rectangle 5) parallelogram http://www.mathslideshows.com square Name The Quadrilateral The sum of all the angles equals 360º degrees in a quadrilateral. 90º 90º 90º 90º http://www.mathslideshows.com Today we are going to find the Area of the Polygons Rectangles & Squares. http://www.mathslideshows.com Area is the number of square units that are needed to cover the surface of a figure. height (h) base (b) How many squares cover this rectangle? The area of this rectangle is 12 squares or 12 units squared. http://www.mathslideshows.com Label the dimensions of this rectangle. 2 units 6 units 2 2 units x 6 units = 12 units . 2 Area is in units because you are multiplying units. http://www.mathslideshows.com We found the area of the rectangle by multiplying the base times the height. 2 units A = bh 6 units The area of a rectangle is also known as the length times the width. A = bh is the same as A = lw http://www.mathslideshows.com What is the area of the rectangle? 5 x 6 2 30 m 5m 2 6m 30 m or square metres http://www.mathslideshows.com PERIMETER: Is the distance around a figure. cm + cm + cm +c m = cm AREA: Is the square units that cover a figure. squared 2 length • width = cm • cm = cm width length VOLUME: The number of cubic units inside a figure. length • width • height 3 cm • cm • cm = cm height cubed http://www.mathslideshows.com width length What is the area of the rectangle? 2 cm 5 cm 2 2 x 5 2 10 cm 10 cm or square centimetres http://www.mathslideshows.com A square is a special rectangle. Since the base and the height are the same size, we call them sides (s) instead of base and height. height = s A= s s s base = s http://www.mathslideshows.com 2 What is the area of the square? 4 x 4 2 16 m. 4 m. 4 m. 2 16 m or square meters http://www.mathslideshows.com What is the area of the square? 5 x 5 2 25 mm 5 mm 5mm 2 25 mm or square millimetres http://www.mathslideshows.com The End! http://www.mathslideshows.com #1 The Area of a figure is the number of square units needed to cover it. 2 3 Rectangle 4 A=2 3 6 square units 6 units2 Square 8m 8m 5 A l w A=s A 5 4 2 A 88 20 un 2 64 m http://www.mathslideshows.com 2 #2 PERIMETER: Is the distance around a figure. in + in + in + in = in AREA: Is the square units that cover a figure. length • width = in • in = squared width 2 in length VOLUME: The number of cubic units inside a figure. length • width • height 3 cubed in • in • in = in http://www.mathslideshows.com height width length
